Telephone signaling apparatus



7 (No Model.)

H. VAN HOEYENBBRGH. Telephone Signaling Apparatus, No. 239,579 PatentedMarch 29,1881.

Ayta/tb'on A.

2 Sheet-Sheet. 2.

(No Model.)

H. VAN HO BVENBERGH. Telephone Signaling Apparatus;

No. 239,579. Patented March 29,188].

MPEYER; mYO-UTHDGRAPMER, WASHINGTON D C UNITED STATES PATENT @FFICEQHENRY VAN HOEVENBERGH, OF ELIZABETH, NEW JERSEY.

TELEPHONE SIGNALING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 239,579, dated March29, 1881.

Application filed November 29,1880. (No model.) v

' To all whom it may concern:

Be it known that I, HENRY VAN HOEVEN- BERGH, a citizen of the UnitedStates, residing at Elizabeth, in the county of Union and State of NewJersey, have invented certain new and useful Improvements in TelephoneSignaling Apparatus, of which the following is a specification.

My invention relates to the construction and arrangement of theapparatus which is em-' the signaling apparatus; second, in thecombination of a main line, a signaling-key, a battery placed betweenthe working-contact of said key and the earth, a receiving-telephoneplaced between the resting-contact of saidkey and the earth, acontact-point placed upon the diaphragm of said telephone and adapted toclose a local circuit by means of the attraction exerted by thetelephone-magnet under the influence of the signaling-current, and anelectro -magnet for actuating the signaling mechanism which is includedin said local circuit, whereby I am enabled to operate the signalingapparatus automatically from the telephone-magnet in the main circuitwithout the necessity of an additional magnet for the purpose, and alsoto dispense with the special switch heretofore employed for the purposeof connecting the main line to the signaling-instrument and to thetelephone-instrument.

In the accompanying drawings, Figure 1 is a diagram representing thearrangement of apparatus and circuits at two terminal stations of atelephone-line embodying my invention. Fig. 2 represents the applicationof my invention to an apparatus in which a voltaic transmitter distinctfrom the receiver is employed.

I have shown in Fig.1 a telephone-line with two terminal stations,respectively designated as station A and station B. As the arrangementof the apparatus and circuits at each of the two stations is preciselythe same, a description of one will be sufiicient to illustrate myinvention.

In the drawings, L represents the line connecting the two stations,which, upon entering 6o .the coil R of a receiving-telephone of theusual construction, and thence, by way of the point 9, to the earth G.When the key K is depressed it disconnects the line L from the branchWire 1, and forms a new connection between the line L and the branchwire 6, which is attached to one pole .of a battery, E, whose remainingpole is connected to the pointy, and consequently with the earth at G.

The receiving-telephone at station A is of the ordinary form, andconsists oi a coil, R,

(hereinbefore men tioned,) which envelopes one of the poles of apermanently-magnetized rod, bar, or core, 1'. In close proximity to theworking-pole of the bar 1 is mounted a thin metallic diaphragm, D, whichis not normally in contact with the bar 1".. The diaphragni D is mountedwithin a cone or mouth-piece in a well-known manner.

The principal advantage intended to be secured by my invention is thatof rendering the coil of the reciving-telephone available to actuate thesignaling apparatus. The introduction into the main circuit of the coilof an additional magnet for this purpose is very objectionable inpractice, inasmuch as the latter 0 tends to absorb the telephonicvibrations and thus render the communications indistinct. In order toobviate the necessity of employing an additional magnet, I placeacontact-point, 61,

upon the under side of the diaphragm D of the 5 receiving-telephone,which is placed opposite to, but not normally in contact with, a similarpoint, which is preferably inserted in the end of themagnetic bar 1".These two contact-points,

when pressed together, complete a local circuit, I00

which is preferably derived from the signalin g-batteryE, as shown inthe figure, although a separate battery may be used, if deemedpreferable, under the circumstance of any particular case. Anelectro-magnet, S, for actuating a signal-bell, or any other well-knownor suitable device serving the same purpose, is included in the saidlocal circuit. Thus it will be understood that telephonic currents, aswell as signaling-currents, arriving by the wire L from the distantstation atB will pass, by the wire I, through thecoil R of thetelephone-receiver directly to the earth at G. The former will merelythrow the diaphragm D into the minute vibrations which suffice toproduce audible and intelligible sounds in the usual and well-knownmanner, while, on the contrary, the signaling currents which proceedfrom the battery at the distant station are of much greater strength andcause the attractive force of the bar 1 to be so augmented asto'poWerfully attract the diaphragm D and to bring the contact-point dmounted thereupon into electrical connection with the bar 1, closing'thelocal circuit, which proceeds frombatteryE by way of wire 20, bar 1",diaphragm D, wire it,

and point g, and includes the electro-magnet' S of the signalingapparatus.

Thus it will be understood that the signalingis effected solely by theaction of the coil B, so far'as'the main circuit is concerned. By thedepression of the key K outgoing signals are sent directly to the line Lfrom the battery E, through the wire e, without passing through any ofthe apparatus within the station, which apparatus is, in fact, whollydisconnected from the line during the operation.

In the arrangement shown in Fig. 1 the telephonic receiver is alsoadapted to be used as a transmitter. The arrangement commonly preferredin practice is that of an independent transmitter, which usuallyconsists of an induction-coil and some some suitable device for varyingthe resistance of the primary circuit of said induction-coil, which iscontrolled by the vibrations of a diaphragm.

In Fig. 2 the wire I, after passing through the coil R of thereceiving-telephone,traverses the primary coil *6 of theinductionapparatus and then goes to the earth at G, as before.

The variable resistance controlled by avibrating diaphragm is shown atT, and is connected by the spring 1) and wire h with one pole of thebattery E, and by the wire 0, the primary coil I of theinductionapparatus, wire P, stop 0, switch 0, and wire h, to the otherpole of the battery.

The switch 0 is represented as an automatic switch of well-knownconstruction, which is operated by the weight of thereceiving-telephone,which,when suspended from it, as shown ally, andwhich obviates the necessity of additional magnets on the maintelephonic circuits.

I claim as my,invention 1. The combination, substantially as hereinbefore set forth, with the magnet and dia phragm of a telephonicreceiver, of a contactpoint" mounted upon said diaphragm, and adapted toclose a local circuit whenever signaling-current of suflicient strengthtraverses the coil of said magnet.

2. The combination, substantially as hereinbefore'set forth, of a mainline, a signalingkey, a battery placed between the workingcontact ofsaid key and the earth, areceivingtelephone, placed between theresting-contact of said key and the earth, a contact-point upon thediaphragm of said telephone, adapted to close a local circuit throughthe attraction exerted by the telephone-magnet under the influence of asignaling-current, and an electromagnet for actuating a signalingmechanism included in saidlo'cal circuit. 1

In testimony whereof I have hereunto subscribed my name this 23d day'ofNovember, A. D. 1880. i

HENRY VAN HOEVENBERGH.

" Witnesses:

' NELSON ZABRISKIE,

MILLER G. EARL.

